【阅读判断】You think that the biggest threat to your health when taking a shower comes from slipping on a bar of soap? Well, guess again.
Q: This paragraph is a question to which the author hopes to have a positive answer from the reader.
答案解析：答案选B。这段话的意思是：你认为淋浴的时候对健康最大的威胁是踩在一块肥皂上而滑倒?好的，再猜一猜。这里的“再猜一猜”可以得知作者希望的不是一个positive answer，而是一个negative answer。
[完成句子]Heavy metals are persistent; they do not break down to other chemicals in the environment. Industrially polluted sites usually undergo intensive clean-up and rehabilitation because heavy metals are a health concern once they enter the food chain. Some trace metals are alleged to cause cancer and are also known to cause poisoning.
Industrially contaminated sites usually require a thorough clean-up due to __________.
A、the persistence of heavy metals
B、industrially polluted soils
C、naturally polluted soils
D、rock and soil chemistry