突变发生在体细胞,结局主要是()
A.发生肿瘤
B.抵抗力下降
C.常见病增多
D.遗传性疾病
参考答案:A
下列器官中具有结肠带、结肠袋、肠脂垂的是
A.回肠
B.阑尾
C.十二指肠
D.盲肠
E.空肠
–What do you think of nature reserve you visited last weekend?
-It’s great. It is ideal home for wildlife.
A.the ; a
B.the; an
C.a; an
D.an; an