今日BBC

1、随身英语
Are sweeteners safe and healthy? 甜味剂是否真的安全又健康？
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For many of us, the relationship we have with sugar is love at first taste, and that love usually lasts a lifetime. But what price do we have to pay for this truly addictive, sugary love? Rotten teeth? Heavier bodies? Raised blood sugar levels? Or even type 2 diabetes?

Time to quit perhaps? Easier said than done. What’s the alternative? Many would suggest using sweeteners as a substitute. But are sweeteners healthier than sugar?

Sweeteners are usually low-calorie or calorie-free substances that have a similar taste to sugar. It is estimated that more than a quarter of British households buy artificial sweeteners to help cut their sugar intake.

2、地道英语
That’ll put hairs on your chest! 那会使你健康强壮！
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4、今日新闻

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Facebook apology after Lahore attack
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Facebook has apologised after its Safety Check system wrongly asked people if they were caught in a bomb attack in Pakistan.
The suicide attack on Sunday in a Lahore park killed more than 70 people, including children.
Facebook’s Safety Check system activates after a tragedy to help people let others know they are safe.
The social network blamed a “bug” for the warnings sent to people thousands of miles away from Pakistan.
Responsibility for the attack on Sunday has been claimed by a Taliban splinter group called Jamaat-ul-Ahrar, which said it targeted Christians celebrating Easter.
Police are still looking in to the claim.
Mistaken message
The Safety Check system is supposed to be a quick way for members of the social network to let friends and family know they are safe if they are caught up in or are close to a natural disaster or attack.
On this occasion, many were made anxious when they received a message because it simply asked “Are you affected by the explosion?” without giving information about how close that person was to any potential threat.
People in the US, India, UK, Hawaii and many other places wrongly received warnings. Many shared images of the messages on social networks.
“Unfortunately, many people not affected by the crisis received a notification asking if they were okay,” said Facebook in a statement.
“This kind of bug is counter to our intent,” it added. “We worked quickly to resolve the issue and we apologise to anyone who mistakenly received the notification.”
The problem is the latest in a series that the Safety Check feature has suffered. Last year, Facebook began to use the system more widely after being criticised about when it was employed. Criticism was levelled at it because it was used for the large-scale attacks in Paris but not subsequently for similar-style bombings in Beirut.

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Oculus founder delivers first Rift headset in person
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The founder of VR (virtual reality) firm Oculus has hand delivered the first Rift headset to a customer.
Palmer Luckey handed over the headset a couple of days before the consumer version of the Rift is officially due to start reaching customers.
The recipient was Ross Martin from Alaska who ordered the headset when pre-orders opened in January.
Mr Luckey said he wanted the “satisfaction” of delivering the first Rift headset.
Special delivery
On 28 March, the consumer-ready Rift headsets should start to reach people who were among the first to order it in January.
Before now the only versions of the headset available were made so developers could familiarise themselves with the software and hardware in the device. The consumer-ready Rift has improved lenses and electronics to make VR as immersive as possible.
Mr Luckey said it was important to him to hand over the headset given that he had been involved in its development since 2009.
“I’ll be damned if some random delivery guy is going to get the satisfaction of delivering the first Rift,” he told game news site Polygon. “That’s mine.”
A video of the handover was posted to Mr Palmer’s page on Facebook. Oculus was bought by Facebook in March 2014 for $2bn (£1.41bn).
‘Regret’
Mr Martin said he had no idea that his headset was going to be handed over by Mr Luckey.
He said he received an email saying it would be delivered on Saturday but assumed everyone who pre-ordered got the same message.
It was only when he rang to confirm delivery that he realised who was handing it over.