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问题 选择题

我国三大棉区说法有误的是（　　）

A．东北平原

B．新疆南部

C．黄河流域

D．长江流域

答案

我国棉花生产集中分布在黄河、长江中下游地区，新疆是我国优质长绒棉产区．

故选：A．

单项选择题

A 7-year-old boy is hospitalized with cystic fibrosis. To help him manage secretions and avoid respiratory distress, the nurse should

A. perform chest physiotherapy every 4 hours.
B. give pancreatic enzymes as ordered.
C. place the child in an oxygen tent and have oxygen administered continuously.
D. serve a high-calorie diet.
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选择题

下列一元二次方程没有实数解的是（　　）

A．x2-2x-1=0

B．（x-1）（x-3）=0

C．x2-2=0

D．x2+x+1=0
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