问题
选择题
With so many problems ____, the new government is in rather a difficult situation.
A．remaining to be solved
B．remained to be solved.
C．remaining to solve
D．remain to solve
答案
答案：A
考察remain用法。Remain作为留下的时候使用remaining;固定结构：sth remain to be done某事有待于被做；句意：有如此多的事情有待于被做，新的政府出于一个相当困难的情况中。
Si + 2x↑。由此推断x的化学式为 ___ 。 