A．helpfulB．radicalC．initialD．vital

【B11】A．helpfulB．heavyC．healthyD．high

【C20】A．mortalB．rationalC．fatalD．vital

【C5】A．necessaryB．acceptableC．importantD．vital

The price of this machine is not reasonable.A.helpfulB.kindC.fairD.effective

材料题请点击右侧查看材料问题 查看材料A.helpfulB.product

The doctors discover will have a ______ effect on mankind.A．extremeB．radicalC．excessiveD．p