三种约束极高温热核聚变燃料的途径都是（）A、磁约束，重力约束、能约束B、重力约束、惯

已开业的小规模企业，其年应税销售额超过小规模纳税人标准的，其申请办理一般纳税人认定手续的时限是( )。

A．次年1月1日以前

B．次年12月31日以前

C．次年4月底以前

D．次年1月底以前

有如下程序：
#include ＜iostream＞
using namespace std;
class XX

protected:
int k;
public:
XX(int n=5):k(n)
～XX()

cout＜＜"XX";

virtual void f() const=0;
;
inline void XX::f()const

cout＜＜k+3;
;
class YY：public XX

public:
～YY()

cout＜＜"YY";

void f() const

cout＜＜k-3;XX::f();

;
int main()

XX &p=* new YY;
p.f();
delete &p;
return 0;

执行上面的程序将输出( )。

A．28XX
B．28YYXX
C．-33XX
D．-33XXYY

《赠薛涛》是出自何人之手？

家风又指门风，是一家或家族世代相传的道德准则和处世方法。有什么样的家风，往往就有什么样的做人、做事态度和为人处世伦理，甚至影响人的一生。这主要表明（）

A.文化对人的影响来自于特定的文化活动

B.文化对人的影响是潜移默化、深远持久的

C.要全面继承传统道德准则和处世伦理

D.传统文化塑造人生，促进人的全面发展

Scientists have found that inserting genes from a plant virus into the genes of a plant susceptible to that virus increases the plant’s resistance to the virus. Because viral diseases account for a significant proportion of crop losses, such genetic alterations, even if carried out on only a modest scale, will significantly reduce crop losses.
Each of the following, if true, strengthens the conclusion above EXCEPT:

A．In areas where two successive crops are raised per year, protecting the first crop from a virus will generally protect the second crop from that virus as well.

B．By repeatedly attacking plants that are genetically altered to become virus-resistant, the virus often becomes less lethal to plants that are not genetically altered in that way.

C．Plants that are genetically altered to become virus-resistant often pass virus-resistant genes on to their offspring.

D．Plants that are made genetically resistant to one kind of virus often acquire resistance to related viral strains as well.

E．(E) Plants that are made genetically resistant to one kind of virus are then more susceptible to infection by unrelated viruses.