根据教学的任务,可将课分为( )。
A.新授课
B.巩固课
C.技能课
D.检查课
E.练习课
参考答案:A,B,C,D
解析:练习课是以教学方法为依据划分的。
22.Some people are worrying about the possibility ________ cellphones could be responsible for a range of illnesses, from rashes to brain tumors.
A.that
B.why
C.how
D.Whether
水灰比大,水泥浆中含水量大,水泥浆稀,混凝土()。