分析有线电视故障的方法中直观法是指()。
参考答案:对一目了然的故障立即排除
My grandfather ______ a bad cold and was ______ last week. [ ]
A. catches; in the hospital
B. has caught; in the hospital
C. caught; in hospital
D. catched; in hospital
下列对于“试管婴儿”的解释,正确的是()
①属于无性生殖
②属于有性生殖
③体外受精
④体内受精
⑤体外发育
⑥体内发育
⑦运用基因工程技术
⑧涉及胚胎工程技术
A.②③⑥⑦⑧
B.①③⑥⑦⑧
C.①③⑤⑧
D.②③⑥⑧