The radiation amount of a mobilephone for two half-hour periods per day is equal to ___ to an X-ray for tenseconds.

I _____without your help. I do appreciate it . —–You are welcome.

下列句子中，句式特点与其他三项不同的一项是（ ）

Mary often does some translation work to earn extra money, which______half of her income. (潍坊市)

erstandings resulting from lack ofsocial communication, if not ______ properly, may lead to serious problems．