2014年上半年，美国的（）密集访华。
A.国务卿克里
B.防长哈格尔
C.司法部总检察长霍尔德
D.大法官约翰·罗伯茨
参考答案：A, B
Almost all the students were having classes when the earthquake _________.
A． broke out
B． put out
C． came out
D． got out
微丝蚴在蚊体内既发育又繁殖。
